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4.2Using the Data Entry and Function Buttons
Data Entry Buttons: The < > arrow buttons select options from the menu currently being displayed on the VFD screen. The selected option blinks.
When the selected option includes a modifiable item, the Δ∇ arrow buttons can be used to increment or decrement that modifiable item.
The Enter button is used to accept any new entries on the VFD screen. The Escape button is used to abort any new entries on the VFD screen that are not yet accepted by use of the Enter button.
Figure 4-1 shows the hierarchy of functions available to the operator via the function buttons. The six function buttons on the analyzer are:
•Analyze. This is the normal operating mode. The analyzer monitors the oxygen content of the sample, displays the percent of oxygen, and warns of any alarm conditions.
•System. The system function consists of six subfunctions that regulate the internal operations of the analyzer:
•Auto-Cal setup
•Password assignment
•Self -Test initiation
•Checking software version
•Logging out.
•Zero. Used to set up a zero calibration.
•Span. Used to set up a span calibration.
•Alarms. Used to set the alarm setpoints and determine whether each alarm will be active or defeated, HI or LO acting, latching, and/or failsafe.
•Range. Used to set up three analysis ranges that can be switched automatically with auto-ranging or used as individual fixed ranges.
Any function can be selected at any time by pressing the appropriate button (unless password restrictions apply). The order as presented in this manual is appropriate for an initial setup.
Each of these functions is described in greater detail in the following procedures. The VFD screen text that accompanies each operation is repro- duced, at the appropriate point in the procedure, in a Monospaced type style. Pushbutton names are printed in Oblique type.
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